Add static_libs property in java_api_library soong module

Package private stub annotations are not part of any API surfaces, but
are included in the `android_<API_SURFACE_NAME>_stubs_current`. Since
these cannot be included in the java_api_library by api_contributions,
add static_libs property to statically include jars in the output jar
file.

Test: m
Change-Id: Icb4401f29079ba32df4c192943a7e8814599d9ba
diff --git a/java/java_test.go b/java/java_test.go
index 21993ec..dc42e9e 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -2128,6 +2128,80 @@
 	}
 }
 
+func TestJavaApiLibraryStaticLibsLink(t *testing.T) {
+	provider_bp_a := `
+	java_api_contribution {
+		name: "foo1",
+		api_file: "foo1.txt",
+	}
+	`
+	provider_bp_b := `
+	java_api_contribution {
+		name: "foo2",
+		api_file: "foo2.txt",
+	}
+	`
+	lib_bp_a := `
+	java_library {
+		name: "lib1",
+		srcs: ["Lib.java"],
+	}
+	`
+	lib_bp_b := `
+	java_library {
+		name: "lib2",
+		srcs: ["Lib.java"],
+	}
+	`
+
+	ctx, _ := testJavaWithFS(t, `
+		java_api_library {
+			name: "bar1",
+			api_surface: "public",
+			api_contributions: ["foo1"],
+			static_libs: ["lib1"],
+		}
+
+		java_api_library {
+			name: "bar2",
+			api_surface: "system",
+			api_contributions: ["foo1", "foo2"],
+			static_libs: ["lib1", "lib2", "bar1"],
+		}
+		`,
+		map[string][]byte{
+			"a/Android.bp": []byte(provider_bp_a),
+			"b/Android.bp": []byte(provider_bp_b),
+			"c/Android.bp": []byte(lib_bp_a),
+			"c/Lib.java":   {},
+			"d/Android.bp": []byte(lib_bp_b),
+			"d/Lib.java":   {},
+		})
+
+	testcases := []struct {
+		moduleName        string
+		staticLibJarNames []string
+	}{
+		{
+			moduleName:        "bar1",
+			staticLibJarNames: []string{"lib1.jar"},
+		},
+		{
+			moduleName:        "bar2",
+			staticLibJarNames: []string{"lib1.jar", "lib2.jar", "bar1/android.jar"},
+		},
+	}
+	for _, c := range testcases {
+		m := ctx.ModuleForTests(c.moduleName, "android_common")
+		mergeZipsCommand := m.Rule("merge_zips").RuleParams.Command
+		for _, jarName := range c.staticLibJarNames {
+			if !strings.Contains(mergeZipsCommand, jarName) {
+				t.Errorf("merge_zips command does not contain expected jar %s", jarName)
+			}
+		}
+	}
+}
+
 func TestTradefedOptions(t *testing.T) {
 	result := PrepareForTestWithJavaBuildComponents.RunTestWithBp(t, `
 java_test_host {